Y_(1.7)Er_(0.3)Fe_(17)快淬带的结构和磁熵变  

Structure and Magnetic Entropy Change of Melt-Spun Y_(1.7)Er_(0.3)Fe_(17) Ribbons

作　　者：胡星浩[1] 侯雪玲[1] 张鹏[1] 汪学真[1] 

机构地区：[1]上海大学,上海200072

出　　处：《稀有金属材料与工程》2011年第2期275-278,共4页Rare Metal Materials and Engineering

基　　金：上海市纳米中心"纳米稀土磁制冷工质材料的研究"资助(0352nm030)

摘　　要：采用熔体快淬法(铜辊速度为20m/s)制备Y1.7Er0.3Fe17快淬带,通过X射线衍射仪、振动样品磁强计(VSM)和三维原子探针(3DAP)对样品的晶体结构、磁熵变和原子在三维空间中分布情况进行研究。结果表明,Y1.7Er0.3Fe17快淬带具有菱方Th2Zn17型结构,与标准PDF卡片(48-1454)相比较,Y2Fe17主相晶胞体积略减小;样品的居里温度在308K附近,磁场变化为1.5T,样品的最大磁熵变值为2.10J·kg-1·K-1;Fe在晶界处含量略有降低,其它区域内,Y、Er和Fe3种原子均匀分布在三维空间中。Melt-spun Y1.7Er0.3Fe17 ribbons were prepared at the wheel speed of 20 m/s.The crystal structure,the magnetic entropy change and three-dimensional atomic mapping of the ribbons were investigated.The results indicate that the melt-spun Y1.7Er0.3Fe17 ribbons crystallize in the hexagonal Th2Zn17 structure,and the lattice parameters of main phase Y2Fe17 in the melt-spun Y1.7Er0.3Fe17 ribbons decrease compared with the standard PDF card（48-1454）.The Curie temperature of melt-spun Y1.7Er0.3Fe17 ribbons is about 308 K,which is close to room temperature,and the maximum magnetic entropy change for a field change of 0-1.5 T is 2.10 J·kg-1·K-1.Three elements（Y,Er and Fe） uniformly distributed in the three-dimensional space except in the grain boundary with lower Fe content.

关 键 词：Y1.7Er0.3Fe17化合物 快淬 磁熵变 二级相变 三维原子探针(3DAP) 

分 类 号：TB64[一般工业技术—制冷工程]